Compaq 1610 Reference Manual page 19

Dual brightness
backlight button
Power button
AC power
connector
Serial connector
Stylus slot
Alarm button
Record button
Provides increased lighting for better
viewing of the screen. For more
information, see "Using the Dual
Brightness Backlight Button" in Chapter 3.
Press once to turn on the device. Press
again to turn off.
Connects to external (AC) power via the
AC Adapter.
Connects serial devices such as the auto-
sync cable or a printer cable.
Holds and protects the stylus when stylus
is not in use.
Press once to stop the alarm when it goes
off. For instructions on using the alarm,
see "Setting the Alarm" in Chapter 8.
Press and hold this button while speaking
into the microphone to record a voice
memo.